Printing inks



. Patented June. 7, 1949 PRINTING INKS Charles A. Rietz, Park Ridge, 111., assignor to In- .terchemical Corporation, New York, N. Y., a

corporation of Ohio No Drawing. Application March 2, 1945,

Serial No. 580,705,

. 1' I This invention relates to'printing inks which can be set or dried by the application of water thereto, and aims to provid an ink of this type, characterized by improved press-stability and printing properties and toughness of film, as compared with previously known inks of the same Inks which may be dried by the application of water upon the freshly printed film and methods of printing with such inks are disclosed and claimed in Gessler et al. Patent No. 2,157,385, dated May 9, 1939. Such inks contain a watersoluble solvent, usually a polyglycol or a polyether alcohol. When water is sprayed upon or otherwise added to a printed film of an ink of this character, it causes the ink binder to be precipitated so that upon evaporation or removal of the solvent and water, such as by penetrationinto the aper, the ink is substantially dry. Due to the fact that the solvents, best suited for use in these inks are hygroscopic,'difllculties in operation are encountered when the weather is humid.

Various methods have been suggested toovercome this problem, among others the use of rosin modified by the diene addition of maleie or fumaric acid (U. S. Patent No.- 2,244,l03,' June 3,

1941). While these improved inks are less susceptible to precipitation difiiculties in humid weather, they leave much to be desired in pri'nt-, ability. In particular, the flow of the inks and the Wetting properties of such vehicles are apt to be poor, resulting in poor impressions from (Durez 12,656), 58 parts diglycol 33 Calcium lithol red (red shade) 3 Barium lithol red (orange shade) 4.5 Blanc fixe 12.0

" 2 Claims. (Cl. 260-332) Example 2 Parts Calcium lithol red 20 Varnish of Example 1 'l0 Diglycol 10 Example 3 A resin was made by reacting 100 parts resoreinol, 100 parts alpha terpineol, 10v parts an acid I catalyst such as phosphoric acid at 100 C. The

resin was dehydrated at 90 C., under vacuum, washed free of catalyst,'heated at 200 C., and

. dumped. A varnish was made from 200 parts by weight of this resin and 125 parts by weight of I dipropylene glycol, by melting together at 120 C. An ink was made by grinding 54 parts by weight of barium lithol red with 168 parts by weight ,of'

the varnish, and 33 parts by weight of dig'lyccl. The ink had unusually good body, printed well at fairly high relative humidities, very readily.

Example 4 A resin was made by reacting 100 parts resorcinol, 100 parts Allo-ccimene,,and 10 parts a catalyst, at 75 C. It'was dehydrated, washed and then milled to 250 C. The overall reaction time was8 hours.

This resin was made up into a varnish and a finished ink in exactly the same fashion as the resin of Example 3. This ink was slightly less stable at high humidity, and gave very satisfactory water-setting.

Examples can of course be multiplied indefinitely Without departing from the scope of the invention as defined in the claims. In particular, other water-soluble polyglycols (e. g. dipropylene glycol, tetraethylene glycol, etc.) and their watersoluble mono-ethers, can be used to replace the diethylene glycol.

I claim:

1. A typographic printing ink characterized by its ability to be set by the addition of water to of the group consisting of water-soluble polyglycols and the water-soluble monoethers thereof.

2. A typographic printing ink characterized by and moisture -set 3 its abilit to be set by the addition of water to REFERENCES 01'!!!) the film and by its improved printing character- The following references are of record m the istics, which comprises pigment dispersed in a. 1 vehicle the essential binder of which is a resin me this patent comprising the condensation product of ter-' 5 UNITED STATES PA'IENTS pineol and a phenol which is soluble in a. poly- Number glycol the resin being dissolved in a solvent of 2,327,594 m 8! i the group consisting o! water-soluble polyglycols and the water soluble monoethers thereof. FOREIGN PATENTS 1 Number Country D t CHARLES Z- 474,465 Great Britain Nov. 2, 193': 

